Greenhouse Gases-Science and Technology
·
2024
·
IF 2.7
Fa-Ping Liu,Ai-Rong Li,Cheng Wang,Yu-Ling Ma
CO 2 hydrate technology can be applied to seawater desalination. However, the kinetics of CO 2 hydrate formation were inhibited in the aqueous solution with inorganic salts, and the kinetic mechanism of CO 2 hydrate formation for inorganic salts with different metal cations and anions was still unclear. In this work, CO 2 hydrate nucleation and growth were studied in aqueous solutions of metal chlorides. Instead of Na + and K + ions, CO 2 hydrate nucleation was promoted in the presence of Ni 2+ , Mn 2+ , Zn 2+ and Fe 3+ ions due to the co-ordination bonds between transition metal ions and water molecules to enhance the formation of the critical crystal nuclei. The induction time was increased by 61.1% in aqueous solution with 0.32 mol/L NaCl, while it was shortened by 55.6% in FeCl 3 aqueous solution at the same concentration of Cl − anions. In the process of CO 2 hydrate growth, Cl − ions played a more important role than the metal ions in affecting the stability of CO 2 hydrate cages. The gas storage capacity was reduced by 10.3% in the presence of NaCl, and was lower than that of other metal chlorides. Cl − anions were absorbed on the hydrate surface and involved in hydrate cages to inhibit the hydrate growth due to the hydrogen bonds between the Cl − ions and water molecules of the hydrate cages. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 10
·期 1
·228-235
·
IF 3.049
Bojie Yuan,Minghao Sui,Hongtao Lu,Jingyu Wang,Jie Qin
Understanding the effect of various environmental factors on the transformation of silver nanoparticles (Ag NPs) is crucial to determine their toxicity and fate in the environment. Ag NPs are inevitably exposed to sunlight and will be in contact with chloride (Cl−), a ubiquitous ligand in natural water, once released into the environment. In this study, the combined effect of Cl− and light on various physicochemical properties (optical property, dissolution, morphology, surface charge) of different sizes Ag NPs was studied. The results showed that light irradiation, in the presence of Cl−, led to a great decrease in the concentration of dissolved Ag and a remarkable increase in the zeta potential of Ag NPs, as well as the generation of some tiny Ag NPs and fusion aggregates. AgCl was suggested to rapidly coat onto Ag NPs after exposure to Cl−. And the AgCl layer was obviously destroyed by photoreduction under light irradiation. Meanwhile, the Ag NP size exhibited a great impact on the destruction of the AgCl layer. It was further observed that the AgCl layer gradually re-formed when the light was removed, which suggested that Ag NPs might present different states during the daytime and at night in aquatic environments.
研究领域:
环境科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Yuwei Ye,Zilong Jiang,Yangjun Zou,Hao Chen,Shengda Guo,Qiumin Yang,Liyong Chen
An eco-friendly and effective corrosion inhibitor (N-CDs) was acquired by hydrothermal method in methacrylic acid and ethyl(methyl)amine precursors. Afterwards, the weight loss and electrochemistry measurement were chosen to appraise the corrosion inhibition behavior of as-prepared N-CDs for Q235 steel in Cl − contained solutions. The change rules of EIS and Tafel data displayed that the as-prepared N-CDs revealed a high-efficiency protection for steel in all test environments. Meanwhile, the inhibition efficiency of steel reached up to 93.93 % (1 M HCl) and 88.96 % (3.5 wt% NaCl) at 200 mg/L of N-CDs. Furthermore, the N-CDs could form the adsorption film on steel surface to avoid the strong attack of Cl − . By analysis, the adsorption mechanism of as-prepared N-CDs on steel surface was physicochemical interaction , which strictly complied with the Langmuir adsorption model in both solutions.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 12
·2537
·
IF 2.467
Lin Chi,Zheng Wang,Youfang Zhou,Shuang Lu,Yan Yao
In this study, the chloride adsorption behaviors of CaAl-Cl LDH precursors with various Ca:Al ratios were investigated. The optimal chloride ion removal rate was 87.06% due to the formation of hydrocalumite. The chloride adsorption products of CaAl-Cl LDH precursors were further characterized by X-ray diffraction analysis and atomic structure analysis, the adsorption mechanism was considered to be co-precipitate process. The chloride adsorption behaviors of cementitious materials blended with CaAl-Cl LDH precursors were further investigated. Leaching test according to Test Code for Hydraulic Concrete (SL352-2006) was performed to testify the stability of chloride ions in the mortar. The results show that more than 98.3% chloride ions were immobilized in cement mortar blended with CaAl-Cl LDH precursor and cannot be easily released again. The inhibition performance of steel in the electrolytes with/without CaAl LDH precursor was investigated by using electrochemical measurements. The results indicate that CaAl LDH precursor can effectively protect the passive film on steel surface by chloride adsorption. Considering the high anion exchange capacities of the LDHs, synthesized chloride adsorbent precursor can be applied as new inhibitors blended in cementitious materials to prevent the chloride-induced deterioration. Moreover, the application of chloride adsorption on CaAl-Cl LDH could also be of interest for the application of seawater blended concrete.Keywords:layered double hydroxides;chloride ion adsorption;corrosion inhibitor
研究领域:
材料科学
·
土木工程
·
防腐蚀研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2016
·
IF 2.822
Cheng Liu,Wenxue Cheng,Qiang Zeng,Xinjian Huang,Lishi Wang
Mercury film modified electrode based stripping voltammetry has become a rapid and low cost method in routine trace element environmental analysis . However, the understanding of the physical and chemical properties of the plated mercury film still needs to be enhanced till now. It has been recognized that the so-called mercury film actually consists of numerous micro mercury droplets, so it is of significant importance to directly investigate the properties and behaviors associated with the individual droplet. Thus, a platinum ultramicroelectrode was used as the substrate for mercury plating, and only one mercury droplet is formed under this condition. Herein, Fourier Transformed Sinusoidal Voltammetry (FTSV) was employed to investigate both the growth process of a mercury droplet and the behaviors of the droplet after plating. Meanwhile, an optical microscope was used to provide direct visual observation. Investigation suggests that: (a) Both the gradual growth process and the fast coalescence event of individual mercury droplet can be resolved with FTSV; (b) The plated mercury droplet can be partially oxidized immediately after the disconnection between the working electrode and the potentiostat in some circumstances, e.g. the presence of trace amount of chloride ion . The present study not only sheds new light on the properties of mercury film electrode but also demonstrates the feasibility of employing FTSV as a new tool for the characterization of micrometer or even nanometer sized particles.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiuxiu Zou,Peng Wang,Zongde Wang,Guorong Fan,Shangxing Chen,Shengliang Liao,Hongyan Si,Meijuan Lu
The discovery that γ -alumina can be prepared at lower calcination temperature from an ammonium aluminum carbonate hydroxide (AACH) precursor templated with rosinyl trimethyl ammonium chloride has led to the assumption that Cl - is capable of lowering the temperature of the phase transformation of AACH to γ -alumina. To verify this hypothesis, several chlorides were introduced into the calcination process of the AACH precursor. The samples were characterized using X-ray diffraction, thermogravimetry and differential scanning calorimetry as well as X-ray photoelectron spectroscopy. The results showed that Cl - has great effects on the crystallinity of γ -alumina obtained by the calcination of AACH. The effects varied with the type, dosage and introduction method of the particular chloride. It was also found that Cl - began to take effect only after the AACH had been decomposed to form amorphous alumina . Therefore, the true function of Cl - is to decrease the temperature of the phase transformation from the amorphous phase to γ -alumina: the phase transformation temperature decreases by as much as 115 K.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD SCIENCE AND TECHNOLOGY RESEARCH
·
2021
·
IF 0.668
Zhe Zheng,Mingwu Qiao,Zhongwei Zhang,Chang Li
The effects of three phytosterols (β-sitosterol, stigmasterol, and campesterol) on the formation of 3-monochloropropane-1,2-diol (3-MCPD) esters and the possible mechanism were investigated in this study. Model reaction with 1,2-dipalmitoyl-sn-glycerol (DPG) and sodium chloride as the reacting precursors was adopted to investigate effects of three phytosterols on the formation of 3-MCPD esters. The results showed that three phytosterols exhibited inhibiting activity on the formation of 3-MCPD esters in the model reactions. ESR signal detection indicated that the phytosterols suppressed the formation of free radical in the model reactions. In addtion, 3-chloro-Δ5-cholestenes were detected in the reaction models by using UPLC-APCI-MS. It suggested that phytosterols reacted with chloride and transformed to 3-chloro-Δ5-cholestenes. Therefore, the possible mechanism of phytosterols inhibiting the formation of 3-MCPD esters could be proposed that phytosterols suppressed formation of free radical intermediates in model reactions and competed with DPG for chloride ion to reduce the formation of 3-MCPD esters.
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2022
·Vol. 233
·期 9
·1-13
·
IF 2.984
Wu Wei,Duan Huike,Chen Jiabin,Xu Jie,Xu Fen,Huang Tianyin,Xu Xiaoyi
In this study, the azo dye acid orange 7 (AO7) was degraded by synergistic activation of persulfate (PMS) with cyclohexanone/chloride ion (Cl − ). The effects of cyclohexanone dosage, PMS concentration, Cl − concentration, initial pH, temperature, and aqueous natural organic matter (NOM) on the AO7 removal were investigated. Under alkaline conditions, the removal rate of AO7 increased with increasing cyclohexanone and Cl − concentrations. The degradation rate of AO7 was unaffected by the water matrix and NOM in the environment. As shown in radical quenching experiments and electron paramagnetic resonance spectroscopy analysis, the main reactive species generated in the reaction system were hypochlorous acid (HCIO) and singlet oxygen ( l O 2 ), which destroyed the azo bond and naphthalene ring structure in AO7. Judging from its ability to degrade AO7, the cyclohexanone/Cl − /PMS system is suitable for treating high-salt wastewater containing organic pollutants.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2023
·
IF 3.8
Jiahao Pan,Wei Wang,Min Ji,Xing Xing,Zhenda Lu
Although various methods have been developed to synthesize Ag nanocubes, their synthesis in oil phase has received little attention. We report a robust method to synthesize single-crystalline Ag nanocubes with high purity (>95%) and uniform size in oil phase. The evolution of Ag nanoparticles from different reaction times indicates that multiply twinned seeds (MTDs) and single-crystalline seeds were formed together at the early stage of the reaction. With the reaction process, the MTDs were gradually etched by chloride ions and air, and the remaining single-crystalline seeds grew into nanocubes. The effect of synthetic parameters such as temperature, air flow, and the concentration of cupric chloride and AgNO3 precursors on the morphology and size of Ag nanocubes has been systematically investigated, among which temperature plays an important role in controlling the balance between the etching rate and growth rate. Due to the slow ion diffusion rate compared to that in the water or polyol system, oil-phase synthesis provides a wide regulatory window for completely etching the MTDs, ensuring the high purity of single-crystalline Ag nanocubes.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Xing Ming,Qing Liu,Miaomiao Wang,Yongqing Cai,Binmeng Chen,Zongjin Li
Chloride-induced corrosion in reinforced concrete is a primary durability issue that causes large economic loss every year. To improve the intrinsic chloride binding capacity and realize a favorable corrosion protection of cement-based materials are thus crucial to prolong the service life of concrete structures. Here, alumina nano particles (ANPs) were incorporated to improve the chloride binding capacity of cement pastes in chloride solutions and the anti-corrosion performance of mortars under accelerated corrosion process. The ANPs facilitated the formation of alumino-ferrite-mono (AFm)-type phases, thereby improved the content of chemically bound chlorides. Solution calcium (Ca) ions benefited the chloride captured by calcium-(alumino-)silicate-hydrates (C-(A-)S-H) in the assistance of ANPs, especially at high initial chloride concentrations , and further evoked a pH-related chloride binding response. Moreover, the enhanced corrosion resistance was finally realized by incorporating appropriate amount of ANPs because of the filling and chemical effects induced low permeability of mortars. In general, the ANPs possess dual functions in the aspects of chloride binding and corrosion inhibition . These findings are expected to advance the design of high-durable cement-based materials serviced in the marine environment.
研究领域:
建筑材料
·
土木工程材料
·
腐蚀科学
·
纳米材料应用
·
混凝土耐久性
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 10
·1643-1649
·
IF 1.89
Zhang Rongli,Xu Sheng,Zhu Ye,Luo Jing,Liu Xiaoya,Tang Dingxing
A simple and facile method of Ag/dopamine modified poly(γ-glutamic acid) nanoparticles (Ag/γ-PGA-DA NPs) was conveniently achieved. By simply adding AgNO 3 to the aqueous solution of γ-PGA-DA copolymer, Ag + was adsorbed in the copolymer and spontaneously reduced to Ag NPs by the dopamine moieties of γ-PGA-DA, leading to the formation of Ag/γ-PGA-DA NPs. In the reaction process, γ-PGA-DA copolymer was used as stabilizer and reductant simultaneously, avoiding the use of extra toxic reducing reagents. The resultant Ag/γ-PGA-DA NPs were used to modify electrode through simple casting method and exhibited a good analytical performance for chloride ion. The Ag/γ-PGA-DA NPs modified electrode responded linearly to chloride ion in the concentration range of 1 × 10 −8 to 1 × 10 −3 mol L −1 . Compared to other published methods for chloride ion sensing, our prepared modified electrode had much wider detection range for chloride ion sensing.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yue Wu,Yangwen Chen,Shouqiang Huang,Guobiao Li,Shunping Sun,Yong Jiang,Guobin Liang,Songjian Zhao,Weiqiao Liu
The chloride (Cl − ) ions in wastewater are difficult to remove, since there is a lack of effective and recyclable chloride removal agents. In this study, the bismuth ferrites (BFO) are first explored as chloride removal agents, and their oxidation or precipitation effects on the Cl − removal are studied. In the BFO samples, the crystal phases of BiFeO 3 and Bi 2 FeO 4 have very limited contributions to the Cl − removal, while the enhanced removal ability is exhibited with the increase of Bi 25 FeO 40 . When the mass percentage of Bi 25 FeO 40 reaches 70%, high Cl − removal efficiencies of 80–90% are achieved, which even exceeds 95% for pure Bi 25 FeO 40 . The morphology and structure characterizations reveal that the excellent Cl − removal performance of Bi 25 FeO 40 is determined by its unstable chemical structure due to the sharing of Bi 5+ and Fe 3+ ions in the tetrahedral positions. The density of states and electron localization function of Bi 25 FeO 40 demonstrate that its Fe and O bonding is weaker than those of BiFeO 3 and Bi 2 FeO 4 , resulting in the easier breaking of the Fe 3+ /Bi 5+ -O bonds to release Bi 5+ ions, which have oxidation ability for the formation of OH and Cl radicals to enhance the Cl − removal efficiency.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）